b) =x³+8x-9

=x³-x²+x²-x+9x-9

=x²(x+1)+x(x+1)+9(x+1)

=(x+1)(x²+x+9)

\(200+200=\text{400}\)

\(OK?\)

p=1,p=3,p=9,p=15,....

\(=\frac{2+\sqrt{2}-\sqrt{3}+2-\sqrt{6}+\sqrt{8}}{2+\sqrt{2}-\sqrt{3}}=1+\frac{\sqrt{2}\left(2+\sqrt{2}-\sqrt{3}\right)}{2+\sqrt{2}-\sqrt{3}}=1+\sqrt{2}\)